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<div class="title">hmac.c</div>  </div>
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<a href="hmac_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/* dtls -- a very basic DTLS implementation</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * Copyright (C) 2011--2012 Olaf Bergmann &lt;bergmann@tzi.org&gt;</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * Permission is hereby granted, free of charge, to any person</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * obtaining a copy of this software and associated documentation</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * files (the &quot;Software&quot;), to deal in the Software without</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> * restriction, including without limitation the rights to use, copy,</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> * modify, merge, publish, distribute, sublicense, and/or sell copies</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * of the Software, and to permit persons to whom the Software is</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> * furnished to do so, subject to the following conditions:</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> * The above copyright notice and this permission notice shall be</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> * included in all copies or substantial portions of the Software.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment"> * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment"> * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment"> * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"> * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment"> * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment"> * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment"> * SOFTWARE.</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="dtls__config_8h.html">dtls_config.h</a>&quot;</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="preprocessor">#ifdef HAVE_ASSERT_H</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;assert.h&gt;</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define assert(x)</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="debug_8h.html">debug.h</a>&quot;</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="hmac_8h.html">hmac.h</a>&quot;</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">/* use malloc()/free() on platforms other than Contiki */</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="preprocessor">#ifndef WITH_CONTIKI</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *</div>
<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="hmac_8c.html#affb72973a7bb7b389a4b7382d435fcef">   46</a></span>&#160;<a class="code" href="hmac_8c.html#affb72973a7bb7b389a4b7382d435fcef">dtls_hmac_context_new</a>() {</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;  <span class="keywordflow">return</span> (<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *)malloc(<span class="keyword">sizeof</span>(<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a>));</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;}</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="hmac_8c.html#a8613e734d3fafa81035f8f30000325a7">   51</a></span>&#160;<a class="code" href="hmac_8c.html#a8613e734d3fafa81035f8f30000325a7">dtls_hmac_context_free</a>(<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *ctx) {</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;  free(ctx);</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;}</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">#else </span><span class="comment">/* WITH_CONTIKI */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &quot;memb.h&quot;</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;MEMB(hmac_context_storage, <a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a>, DTLS_HASH_MAX);</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<a class="code" href="hmac_8c.html#affb72973a7bb7b389a4b7382d435fcef">dtls_hmac_context_new</a>() {</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;  <span class="keywordflow">return</span> (<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *)memb_alloc(&amp;hmac_context_storage);</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;}</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<a class="code" href="hmac_8c.html#a8613e734d3fafa81035f8f30000325a7">dtls_hmac_context_free</a>(<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *ctx) {</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;  memb_free(&amp;hmac_context_storage, ctx);</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;}</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<a class="code" href="hmac_8h.html#a51d5982243691c9e7fa56142c3a8d5d8">dtls_hmac_storage_init</a>() {</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;  memb_init(&amp;hmac_context_storage);</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;}</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* WITH_CONTIKI */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"><a class="line" href="group__HMAC.html#ga1ef9c88a0a2053b442413a9cea3deb73">   76</a></span>&#160;<a class="code" href="group__HMAC.html#ga1ef9c88a0a2053b442413a9cea3deb73">dtls_hmac_update</a>(<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *ctx,</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;         <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *input, <span class="keywordtype">size_t</span> ilen) {</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;  assert(ctx);</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;  <a class="code" href="hmac_8h.html#adb5ad07ab9a1adcdfdc20e13aa37bee6">dtls_hash_update</a>(&amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>, input, ilen);</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;}</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *</div>
<div class="line"><a name="l00083"></a><span class="lineno"><a class="line" href="group__HMAC.html#gac3e9ef037800963783e618eafd046702">   83</a></span>&#160;<a class="code" href="group__HMAC.html#gac3e9ef037800963783e618eafd046702">dtls_hmac_new</a>(<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *key, <span class="keywordtype">size_t</span> klen) {</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;  <a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *ctx;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;  ctx = <a class="code" href="hmac_8c.html#affb72973a7bb7b389a4b7382d435fcef">dtls_hmac_context_new</a>();</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;  <span class="keywordflow">if</span> (ctx) </div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    <a class="code" href="group__HMAC.html#gaa1eb35fcb2c2eb69eebaefa8eb4a790d">dtls_hmac_init</a>(ctx, key, klen);</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;  <span class="keywordflow">return</span> ctx;</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;}</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="group__HMAC.html#gaa1eb35fcb2c2eb69eebaefa8eb4a790d">   94</a></span>&#160;<a class="code" href="group__HMAC.html#gaa1eb35fcb2c2eb69eebaefa8eb4a790d">dtls_hmac_init</a>(<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *ctx, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *key, <span class="keywordtype">size_t</span> klen) {</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;  assert(ctx);</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;  memset(ctx, 0, <span class="keyword">sizeof</span>(<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a>));</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;  <span class="keywordflow">if</span> (klen &gt; <a class="code" href="group__HMAC.html#gab1f8617a558ef0f758439c96d3a4650e">DTLS_HMAC_BLOCKSIZE</a>) {</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;    <a class="code" href="hmac_8h.html#afe0af64930ac5d6a51289df6d1eb4f52">dtls_hash_init</a>(&amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>);</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    <a class="code" href="hmac_8h.html#adb5ad07ab9a1adcdfdc20e13aa37bee6">dtls_hash_update</a>(&amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>, key, klen);</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <a class="code" href="hmac_8h.html#a96801bbb62f4c9c872b22cd8e438e51e">dtls_hash_finalize</a>(ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#aba13422e176f7d16f3f251634ca7f868">pad</a>, &amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>);</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;  } <span class="keywordflow">else</span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    memcpy(ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#aba13422e176f7d16f3f251634ca7f868">pad</a>, key, klen);</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;  <span class="comment">/* create ipad: */</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;  <span class="keywordflow">for</span> (i=0; i &lt; <a class="code" href="group__HMAC.html#gab1f8617a558ef0f758439c96d3a4650e">DTLS_HMAC_BLOCKSIZE</a>; ++i)</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#aba13422e176f7d16f3f251634ca7f868">pad</a>[i] ^= 0x36;</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;  <a class="code" href="hmac_8h.html#afe0af64930ac5d6a51289df6d1eb4f52">dtls_hash_init</a>(&amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>);</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;  <a class="code" href="group__HMAC.html#ga1ef9c88a0a2053b442413a9cea3deb73">dtls_hmac_update</a>(ctx, ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#aba13422e176f7d16f3f251634ca7f868">pad</a>, DTLS_HMAC_BLOCKSIZE);</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;  <span class="comment">/* create opad by xor-ing pad[i] with 0x36 ^ 0x5C: */</span></div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;  <span class="keywordflow">for</span> (i=0; i &lt; <a class="code" href="group__HMAC.html#gab1f8617a558ef0f758439c96d3a4650e">DTLS_HMAC_BLOCKSIZE</a>; ++i)</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#aba13422e176f7d16f3f251634ca7f868">pad</a>[i] ^= 0x6A;</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;}</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"><a class="line" href="group__HMAC.html#ga5b1a3c1dcb5461bda44dd70f7bd33181">  121</a></span>&#160;<a class="code" href="group__HMAC.html#ga5b1a3c1dcb5461bda44dd70f7bd33181">dtls_hmac_free</a>(<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *ctx) {</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;  <span class="keywordflow">if</span> (ctx)</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    <a class="code" href="hmac_8c.html#a8613e734d3fafa81035f8f30000325a7">dtls_hmac_context_free</a>(ctx);</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;}</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;<span class="keywordtype">int</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"><a class="line" href="group__HMAC.html#gab98c992f3f9cc3c2d75077ddd46049bf">  127</a></span>&#160;<a class="code" href="group__HMAC.html#gab98c992f3f9cc3c2d75077ddd46049bf">dtls_hmac_finalize</a>(<a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *ctx, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *result) {</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> buf[<a class="code" href="group__HMAC.html#ga060019cf2dab9903d58118fe1abe7018">DTLS_HMAC_DIGEST_SIZE</a>];</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;  <span class="keywordtype">size_t</span> len; </div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;  assert(ctx);</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;  assert(result);</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;  </div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;  len = <a class="code" href="hmac_8h.html#a96801bbb62f4c9c872b22cd8e438e51e">dtls_hash_finalize</a>(buf, &amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>);</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;  <a class="code" href="hmac_8h.html#afe0af64930ac5d6a51289df6d1eb4f52">dtls_hash_init</a>(&amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>);</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;  <a class="code" href="hmac_8h.html#adb5ad07ab9a1adcdfdc20e13aa37bee6">dtls_hash_update</a>(&amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>, ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#aba13422e176f7d16f3f251634ca7f868">pad</a>, <a class="code" href="group__HMAC.html#gab1f8617a558ef0f758439c96d3a4650e">DTLS_HMAC_BLOCKSIZE</a>);</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;  <a class="code" href="hmac_8h.html#adb5ad07ab9a1adcdfdc20e13aa37bee6">dtls_hash_update</a>(&amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>, buf, len);</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;  len = <a class="code" href="hmac_8h.html#a96801bbb62f4c9c872b22cd8e438e51e">dtls_hash_finalize</a>(result, &amp;ctx-&gt;<a class="code" href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">data</a>);</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;  <span class="keywordflow">return</span> len;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;}</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;<span class="preprocessor">#ifdef HMAC_TEST</span></div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv) {</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;  <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> buf[<a class="code" href="group__HMAC.html#ga060019cf2dab9903d58118fe1abe7018">DTLS_HMAC_DIGEST_SIZE</a>];</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;  <span class="keywordtype">size_t</span> len, i;</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;  <a class="code" href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a> *ctx;</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;  <span class="keywordflow">if</span> (argc &lt; 3) {</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    fprintf(stderr, <span class="stringliteral">&quot;usage: %s key text&quot;</span>, argv[0]);</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;    <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;  }</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;  <a class="code" href="hmac_8h.html#a51d5982243691c9e7fa56142c3a8d5d8">dtls_hmac_storage_init</a>();</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;  ctx = <a class="code" href="group__HMAC.html#gac3e9ef037800963783e618eafd046702">dtls_hmac_new</a>(argv[1], strlen(argv[1]));</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;  assert(ctx);</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;  <a class="code" href="group__HMAC.html#ga1ef9c88a0a2053b442413a9cea3deb73">dtls_hmac_update</a>(ctx, argv[2], strlen(argv[2]));</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;  </div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;  len = <a class="code" href="group__HMAC.html#gab98c992f3f9cc3c2d75077ddd46049bf">dtls_hmac_finalize</a>(ctx, buf);</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;  <span class="keywordflow">for</span>(i = 0; i &lt; len; i++) </div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    printf(<span class="stringliteral">&quot;%02x&quot;</span>, buf[i]);</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;  printf(<span class="stringliteral">&quot;\n&quot;</span>);</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;  <a class="code" href="group__HMAC.html#ga5b1a3c1dcb5461bda44dd70f7bd33181">dtls_hmac_free</a>(ctx);</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;}</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="ttc" id="hmac_8c_html_affb72973a7bb7b389a4b7382d435fcef"><div class="ttname"><a href="hmac_8c.html#affb72973a7bb7b389a4b7382d435fcef">dtls_hmac_context_new</a></div><div class="ttdeci">static dtls_hmac_context_t * dtls_hmac_context_new()</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8c_source.html#l00046">hmac.c:46</a></div></div>
<div class="ttc" id="group__HMAC_html_ga1ef9c88a0a2053b442413a9cea3deb73"><div class="ttname"><a href="group__HMAC.html#ga1ef9c88a0a2053b442413a9cea3deb73">dtls_hmac_update</a></div><div class="ttdeci">void dtls_hmac_update(dtls_hmac_context_t *ctx, const unsigned char *input, size_t ilen)</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8c_source.html#l00076">hmac.c:76</a></div></div>
<div class="ttc" id="dtls__config_8h_html"><div class="ttname"><a href="dtls__config_8h.html">dtls_config.h</a></div></div>
<div class="ttc" id="debug_8h_html"><div class="ttname"><a href="debug_8h.html">debug.h</a></div></div>
<div class="ttc" id="group__HMAC_html_ga5b1a3c1dcb5461bda44dd70f7bd33181"><div class="ttname"><a href="group__HMAC.html#ga5b1a3c1dcb5461bda44dd70f7bd33181">dtls_hmac_free</a></div><div class="ttdeci">void dtls_hmac_free(dtls_hmac_context_t *ctx)</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8c_source.html#l00121">hmac.c:121</a></div></div>
<div class="ttc" id="group__HMAC_html_ga060019cf2dab9903d58118fe1abe7018"><div class="ttname"><a href="group__HMAC.html#ga060019cf2dab9903d58118fe1abe7018">DTLS_HMAC_DIGEST_SIZE</a></div><div class="ttdeci">#define DTLS_HMAC_DIGEST_SIZE</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8h_source.html#l00074">hmac.h:74</a></div></div>
<div class="ttc" id="hmac_8h_html"><div class="ttname"><a href="hmac_8h.html">hmac.h</a></div></div>
<div class="ttc" id="group__HMAC_html_gaa1eb35fcb2c2eb69eebaefa8eb4a790d"><div class="ttname"><a href="group__HMAC.html#gaa1eb35fcb2c2eb69eebaefa8eb4a790d">dtls_hmac_init</a></div><div class="ttdeci">void dtls_hmac_init(dtls_hmac_context_t *ctx, const unsigned char *key, size_t klen)</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8c_source.html#l00094">hmac.c:94</a></div></div>
<div class="ttc" id="structdtls__hmac__context__t_html"><div class="ttname"><a href="structdtls__hmac__context__t.html">dtls_hmac_context_t</a></div><div class="ttdef"><b>Definition:</b> <a href="hmac_8h_source.html#l00095">hmac.h:95</a></div></div>
<div class="ttc" id="group__HMAC_html_gac3e9ef037800963783e618eafd046702"><div class="ttname"><a href="group__HMAC.html#gac3e9ef037800963783e618eafd046702">dtls_hmac_new</a></div><div class="ttdeci">dtls_hmac_context_t * dtls_hmac_new(const unsigned char *key, size_t klen)</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8c_source.html#l00083">hmac.c:83</a></div></div>
<div class="ttc" id="hmac_8h_html_afe0af64930ac5d6a51289df6d1eb4f52"><div class="ttname"><a href="hmac_8h.html#afe0af64930ac5d6a51289df6d1eb4f52">dtls_hash_init</a></div><div class="ttdeci">static void dtls_hash_init(dtls_hash_t ctx)</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8h_source.html#l00043">hmac.h:43</a></div></div>
<div class="ttc" id="structdtls__hmac__context__t_html_aba13422e176f7d16f3f251634ca7f868"><div class="ttname"><a href="structdtls__hmac__context__t.html#aba13422e176f7d16f3f251634ca7f868">dtls_hmac_context_t::pad</a></div><div class="ttdeci">unsigned char pad[DTLS_HMAC_BLOCKSIZE]</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8h_source.html#l00096">hmac.h:96</a></div></div>
<div class="ttc" id="hmac_8h_html_adb5ad07ab9a1adcdfdc20e13aa37bee6"><div class="ttname"><a href="hmac_8h.html#adb5ad07ab9a1adcdfdc20e13aa37bee6">dtls_hash_update</a></div><div class="ttdeci">static void dtls_hash_update(dtls_hash_t ctx, const unsigned char *input, size_t len)</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8h_source.html#l00048">hmac.h:48</a></div></div>
<div class="ttc" id="group__HMAC_html_gab98c992f3f9cc3c2d75077ddd46049bf"><div class="ttname"><a href="group__HMAC.html#gab98c992f3f9cc3c2d75077ddd46049bf">dtls_hmac_finalize</a></div><div class="ttdeci">int dtls_hmac_finalize(dtls_hmac_context_t *ctx, unsigned char *result)</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8c_source.html#l00127">hmac.c:127</a></div></div>
<div class="ttc" id="hmac_8c_html_a8613e734d3fafa81035f8f30000325a7"><div class="ttname"><a href="hmac_8c.html#a8613e734d3fafa81035f8f30000325a7">dtls_hmac_context_free</a></div><div class="ttdeci">static void dtls_hmac_context_free(dtls_hmac_context_t *ctx)</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8c_source.html#l00051">hmac.c:51</a></div></div>
<div class="ttc" id="group__HMAC_html_gab1f8617a558ef0f758439c96d3a4650e"><div class="ttname"><a href="group__HMAC.html#gab1f8617a558ef0f758439c96d3a4650e">DTLS_HMAC_BLOCKSIZE</a></div><div class="ttdeci">#define DTLS_HMAC_BLOCKSIZE</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8h_source.html#l00073">hmac.h:73</a></div></div>
<div class="ttc" id="hmac_8h_html_a96801bbb62f4c9c872b22cd8e438e51e"><div class="ttname"><a href="hmac_8h.html#a96801bbb62f4c9c872b22cd8e438e51e">dtls_hash_finalize</a></div><div class="ttdeci">static size_t dtls_hash_finalize(unsigned char *buf, dtls_hash_t ctx)</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8h_source.html#l00053">hmac.h:53</a></div></div>
<div class="ttc" id="hmac_8h_html_a51d5982243691c9e7fa56142c3a8d5d8"><div class="ttname"><a href="hmac_8h.html#a51d5982243691c9e7fa56142c3a8d5d8">dtls_hmac_storage_init</a></div><div class="ttdeci">static void dtls_hmac_storage_init()</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8h_source.html#l00060">hmac.h:60</a></div></div>
<div class="ttc" id="structdtls__hmac__context__t_html_a84c35513fa655d8456be215f4509bb40"><div class="ttname"><a href="structdtls__hmac__context__t.html#a84c35513fa655d8456be215f4509bb40">dtls_hmac_context_t::data</a></div><div class="ttdeci">dtls_hash_ctx data</div><div class="ttdef"><b>Definition:</b> <a href="hmac_8h_source.html#l00097">hmac.h:97</a></div></div>
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